JP3900339B2 - Liquid absorbent sheet for packaging fresh food - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is for fresh food packaging that can absorb and remove leached drips in the process of storing or distributing fresh foods such as meat, vegetables, fruits and fish, and prevent discoloration and quality deterioration of fresh foods over a long period of time. It relates to a liquid-absorbing sheet. More specifically, when the absorbent sheet for packaging fresh food is used, both the front and back are prevented from being misused, and the absorbent sheet for packaging fresh food is provided with an identification mark that does not give a sense of incongruity even after the liquid is absorbed. The present invention relates to a method for manufacturing a food product.
[0002]
[Prior art]
Fresh food such as meat and fish (hereinafter sometimes referred to simply as “food”) is vacuum-packed with a non-breathable film and then stored at chilled temperature or thawed after freezing. A so-called drip liquid such as body fluid oozes out. This drip accumulates between the food and the non-breathable film, and if left untreated, they degrade the quality such as discoloring the food that comes into contact, and significantly reduce the commercial value. In order to avoid this, if the discolored portion of the food is removed, the product yield will be reduced accordingly. Furthermore, this drip has a number of problems such as being easy to become a breeding ground for bacteria and shortening the storage period.
[0003]
Therefore, a method for removing drip from packaged fresh food was studied. At the beginning of the removal method, the food is packaged in contact with the sheet-like liquid absorbing material, and drip leached during storage is absorbed by the liquid absorbing material as needed to remove it. As the liquid absorbent material, a capillary liquid absorbent material such as paper pulp, which has a hydrophilic surface and can absorb and retain drip by capillary action, a so-called polymer water absorbent, or a composite thereof is used.
However, the capillary absorbent material is weak as a sheet material, and the polymer water-absorbing agent is generally in the form of powder or granules, and there is a problem in bringing it into direct contact with food. A liquid-absorbing sheet for packaging fresh food covered with a liquid-permeable film (hereinafter sometimes simply referred to as “liquid-absorbing sheet”) has been proposed, and dripping countermeasures have been greatly improved. However, this liquid absorbent sheet not only drips leached from food such as meat and fish, but also actively absorbs moisture from the food contact surface, so the food itself may dry.
[0004]
As a liquid-absorbing sheet that improves this, it absorbs only drip leached from foods such as meat and fish, and does not actively absorb moisture inside the food from the food contact surface, so that the food itself does not dry, Absorbs and removes drip that oozes out and accumulates in the bottom and recesses of food that is in contact with the liquid-absorbent sheet, prevents food discoloration and quality degradation over a long period of time, and maintains yield Thus, a liquid-absorbing sheet using a cover-like packaging material using a liquid-permeable film on one side and a non-liquid-permeable film or a semi-liquid-permeable film on the other side has been proposed.
[0005]
In order to avoid direct or local moisture absorption from the inside of the food, this liquid-absorbing sheet is used with the surface of the non-liquid-permeable film or semi-permeable film in contact with the food. . For this reason, the sheet-like liquid absorbent material has been devised such as coloring or printing in order to identify the front and back, but the colors and colors that will be clear identification signs to improve the consumer's sense of perception and the appearance of the product Since patterns and the like have been avoided, the front and back discriminability has declined, and in packaging, the liquid-permeable film surface, which is often the opposite surface, has been packaged so as to be in direct contact with food. Once such packaging has been made, it has been difficult to easily detect it from the outside.
[0006]
[Problems to be solved by the invention]
When packaging with a non-breathable film or the like, the present invention can be easily identified so that the appropriate surface of the liquid-absorbing sheet disposed on the inner surface is the food side, and the opposite surface is disposed on the food side. In this case, an object of the present invention is to develop a liquid-absorbing sheet that can be easily identified from the outside even after packaging and that has an identification mark that is difficult for consumers to identify after liquid absorption or that does not give a sense of incongruity.
[0007]
[Means for Solving the Problems]
The present invention provides [1] a polymer absorbent and / or a wetting agent in a packaging material in which one outer surface is a liquid-permeable film and the other outer surface is a non-liquid-permeable film or a semi-permeable film. A liquid-absorbing sheet for packaging fresh food containing a sheet-like liquid-absorbing material, and inserting a colored film or tape of the same color as that of fresh food into at least a part of one side of the liquid-absorbing sheet , A liquid-absorbing sheet for fresh food packaging, characterized in that an identification mark sandwiched and sealed is provided in a heat-sealed portion of a liquid-permeable film and a non-liquid-permeable film or a semi-permeable film , [2] beef packaging A liquid-absorbing sheet for fresh food packaging used in the above, wherein the liquid-absorbing sheet for fresh food packaging according to [1], wherein the color is red, [3] fresh food used for vegetable or fruit packaging An absorbent sheet for food packaging, The liquid-absorbing sheet for packaging fresh food as set forth in [1], wherein [4] is a liquid-absorbing sheet for packaging fresh food used in poultry, pork or fish packaging, The liquid absorbing sheet for packaging fresh food according to [1], wherein the color is pink, yellow or brown
[0008]
[5] The liquid-absorbent sheet for packaging fresh food according to any one of [1] to [4], wherein an identification mark is provided on the non-liquid-permeable film or semi-permeable film side.
[6] The liquid absorbent sheet for fresh food packaging according to any one of [1] to [4], wherein an identification mark is provided on the liquid-permeable film side.
[0009]
[7] The liquid-absorbent sheet for fresh food packaging according to any one of [1] to [6], wherein the semi-permeable film has a hole formed in a polyethylene film or a polypropylene film,
[8] The sheet-like liquid absorbing material is a wetting agent such as ethylene glycol, propylene glycol, diethylene glycol monoethyl ether, 1,3-butylene glycol, glycerin, polyethylene glycol, polypropylene glycol, polyglycerin, xylitol, sorbitol, maltitol, methyl The liquid-absorbent sheet for packaging fresh food according to any one of [1] to [7], comprising at least one member selected from the group consisting of cellulose and carboxymethyl cellulose;
[9] A non-liquid-permeable film or semi-permeable liquid absorbent sheet for fresh food packaging according to any one of [1], [2], [4], [5], [7] and [8] A method for producing a fresh food product, comprising a step of contacting the surface of the liquid-permeable film, vacuum-packing with a non-breathable film and absorbing the liquid,
[10] Let the fresh food face the liquid-permeable film side of the absorbent sheet for fresh food packaging according to any one of [1], [3], [4], and [6] to [8]. The above object has been achieved by developing a method for producing a fresh food product characterized by including a step of packaging and absorbing liquid.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
One of the packaging materials used in the liquid-absorbing sheet of the present invention is a liquid-permeable film, and the other is composed of a non-liquid-permeable film or a semi-permeable film.
[0011]
The liquid-permeable film used in the liquid-absorbing sheet of the present invention has water permeability and water resistance, and has pores of a size that does not leak liquid-absorbing material, particularly powdery polymer water-absorbing agent, preferably Any generally available material may be used as long as it is heat-sealable and acceptable for food packaging. For example, it may be formed from any one of the group consisting of woven fabrics, knitted fabrics and nonwoven fabrics such as natural fibers, semi-synthetic fibers, synthetic fibers or synthetic resins, or a laminate thereof. Further, non-liquid permeable films such as polyethylene film, polypropylene film, polyester film and moisture-proof cellophane, etc., which are formed with fine communication holes by a known mechanical or electrical means or by laser, etc. It may be a mesh sheet.
Such a liquid-permeable film is so-called water-permeable, generally has a porosity of 1% or more, and is clearly distinguished from a semi-permeable film. This liquid-permeable film is provided to quickly permeate and absorb the drip that has leached from the surface of the food that is not in contact with the liquid-absorbing sheet and moved to the water-absorbing sheet due to vibration, gravity, etc. during transportation. It is what was done.
[0012]
Examples of the non-liquid permeable film used on the opposite surface of the liquid permeable film include a polyethylene film, a polypropylene film, a polyvinylidene chloride film, a polyester film, a moisture-proof cellophane, and a polyethylene laminated aluminum foil. Among them, polyethylene film or polypropylene film does not contain any substances that may contaminate food, does not occur, has no water absorption or water permeability in itself, is flexible, and has good peelability from pressure-bonded food. In addition, it is particularly preferable because it has heat sealability and is inexpensive.
[0013]
Moreover, as a semi-permeable film, it can manufacture by forming a hole with a well-known mechanical and electrical means or a laser etc. in said non-permeable film. However, unlike the liquid permeable film, the water permeability needs to be extremely small and have a limited degree of opening.
That is, the diameter d of the opening is in the range of 0.05 mm to 0.5 mm, preferably in the range of 0.1 mm to 0.3 mm, and the opening ratio P is 0.01% to 0.4%. It is formed so as to be within the range, preferably within the range of 0.01% to 0.2%. The apertures are preferably distributed uniformly throughout the semi-permeable film. Further, the shape of the opening is not particularly limited as long as it is within the range of the hole diameter and the opening ratio.
[0014]
Here, the opening ratio P is a% value represented by (total area of openings / total area of semi-permeable film) × 100, and when the area s of each opening is the same, It is given by the perforation area s × number of openings n × 100) / (total area of semi-permeable film).
[0015]
When the liquid-absorbing sheet of the present invention is used, food is brought into contact with the surface of a non-permeable film or a semi-permeable film, and the whole is vacuum-packed and stored with a non-permeable film. A drip leached from the food in contact with the liquid film is introduced into the liquid-absorbing sheet through this opening. Accordingly, in order to absorb only the drip without dehydrating the food in contact, the hole diameter d is preferably in the range of 0.05 to 0.5 mm.
[0016]
Moreover, it is preferable that the liquid-permeable film and the non-liquid-permeable film or the semi-liquid-permeable film are both heat-sealable and form one surface of the packaging material of the liquid-absorbent sheet. By heat-sealing the periphery of both films, peeling between the films of the liquid-absorbing sheet can be prevented, and leakage of a built-in polymer water-absorbing agent or the like can be prevented.
[0017]
The sheet-like liquid-absorbing material may be used as long as it is used for absorbing the drip that oozes out from the food and does not adversely affect the human body when the food is stored.
The sheet-like liquid absorbing material desirably does not release drip and water once absorbed by pressurization or the like, and for that purpose, it preferably includes a polymer absorbent such as a polymer water absorbent. As the polymer water-absorbing agent used for the sheet-like liquid-absorbing material, any known water-absorbing agent may be used as long as it has moisture and drip absorption capability and is acceptable in food safety. These are generally three-dimensionally crosslinked water-soluble polymers, and many types are known.
[0018]
Preferred polymer water-absorbing agents are polysaccharides such as starch and cellulose, acrylic acid, methacrylic acid, acrylate, methacrylate, acrylate, methacrylate, acrylate, methacrylate, acrylonitrile, methacrylate. Crosslinking of a polymer obtained by graft polymerization of a nitrile, maleic acid, sulfonated styrene, polyvinyl pyridine, or an oligomer or co-oligomer thereof, or by graft polymerization and hydrolysis. One or more of the group consisting of product, polyethylene oxide, polypropylene oxide, polyvinyl pyrrolidone, sulfonated polyethylene, polyvinyl pyridine, polyacrylate, polymethacrylate, polyacrylamide, polymethacrylamide Bridge products, vinyl acetate-acrylate copolymers, isobutylene-maleic anhydride copolymers, polyvinyl alcohol-maleic acid copolymers, carboxymethyl cellulose cross-linked products, etc., for example, commercially available liquid absorbent sheets Examples of the polymeric water-absorbing agent include PX-402A (manufactured by Showa Denko KK), Sunwet IM-300 (manufactured by Sanyo Kasei Kogyo Co., Ltd.), Aquakeep 10SH (manufactured by Steel Manufacturing Chemical Co., Ltd.), Aquaric CA ( Nippon Shokubai Chemical Industry Co., Ltd.).
[0019]
The sheet-like liquid-absorbing material of the present invention is preferably a material in which the above-described polymer water-absorbing agent is held by a capillary-absorbing material that can absorb liquid by capillary action. Capillary liquid-absorbing material is a sheet-like product that can absorb and retain drip or moisture by capillarity, and retains the polymer water-absorbing agent, and more preferably the wetting agent described later It is. Examples include paper, pulp, pulp sheet made of pulp, absorbent cotton, gauze, woven fabric, knitted fabric, non-woven fabric, sponge, open pore polyurethane foam, open pore viscose foam, open pore vinylon foam, etc. Can do.
[0020]
Since the polymer water-absorbing agent is generally powdered or granular when dried, in order to incorporate it in the liquid-absorbing sheet, it may be dispersed and held between two layers of the capillary liquid-absorbing material, or 1 It may be inserted and held inside the communication hole of the capillary liquid-absorbing material of the layer. In addition, a commercially available product in which a polymer water-absorbing agent is held in a capillary liquid-absorbing material, for example, a highly water-absorbing sheet used in the field of paper diapers, sanitary treatment products, soil improvers, etc. can also be used as the liquid-absorbing material.
[0021]
The polymer water-absorbing agent absorbs drip and moisture that have passed through the openings of the semi-permeable film and the fine communication holes of the permeable film, and further passed through the layer of the capillary absorbent material. After that, unlike ordinary capillary liquid absorbers, they do not flow back even when external pressure or impact is applied.
[0022]
In the present invention, the sheet-like liquid absorbing material preferably contains a wetting agent. Generally, a polymer absorbent becomes hard when dried, and there is a risk of damaging a packaging material film or a non-breathable film that wraps the whole food by impact or friction during transportation or movement. The addition of the wetting agent keeps the polymer water-absorbing agent flexible even during drying, so that such damage can be prevented, and for example, the pinhole ratio of a non-breathable film for vacuum packaging can be reduced.
[0023]
In addition, when the above-mentioned capillary absorbent material has a hydrophobic surface, the initial water absorption is generally poor, but if the hydrophobic surface is covered with wettability, the initial water absorption is greatly improved and the semi-permeable film is opened. The drip and moisture introduced from the pores and the fine communication holes of the liquid-permeable film can be quickly absorbed. The amount of the wetting agent used is not particularly limited as long as it makes the liquid absorbing material soft and does not substantially leak even when subjected to pressure. The appropriate amount is experimentally determined in consideration of the material and configuration of the liquid absorbing material to be used, the total area of the capillary wall, and the like.
[0024]
Examples of this wetting agent include, for example, polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol monoethyl ether, 1,3-butylene glycol and glycerin, polyhydric alcohol polymers such as polyethylene glycol, polypropylene glycol and polyglycerin, Examples thereof include sugar alcohols such as xylitol, sorbitol, and maltitol, methyl cellulose, and carboxymethyl cellulose. These are used in the form of an aqueous solution as necessary. In particular, glycerin is preferable from the viewpoint of wettability and safety.
[0025]
When producing fresh food products by vacuum packaging and absorbing liquid using a non-breathable film, the food and the absorbent sheet are used in close contact with each other. It is preferable that the food is brought into contact with the surface of the non-liquid-permeable film or semi-permeable film of the sheet. By doing in this way, it can prevent that a liquid-permeable film contacts food and food itself dries.
When manufacturing fresh food products by packaging foods and liquid-absorbing sheets with a packaging method other than vacuum packaging to absorb liquids, the liquid-permeable film side of the liquid-absorbing sheet is opposite to the case of vacuum packaging. It is preferable to arrange and package the food so that they face each other. By doing in this way, absorption of a liquid becomes quicker compared with the case where a liquid absorbing sheet is arrange | positioned so that the side of a non-liquid-permeable film or a semi-liquid-permeable film may face food.
As described above, it is more effective to select the surface of the liquid-absorbing sheet facing the food according to the packaging form, and to arrange and absorb the liquid so that at least a part of the liquid-absorbing sheet is at the bottom of the food during transportation or storage. This is a typical method of using the liquid absorbing sheet.
[0026]
In order to produce a fresh food product by packaging food using the liquid-absorbing sheet of the present invention and allowing the liquid to be absorbed, the liquid-absorbing sheet is preferably packaged so that the side provided with the identification mark is the food side. To use. By using in this way, it can be easily seen from the outside that the front and back of the liquid absorbent sheet are not used as intended during packaging, and at the same time, the identification mark after liquid absorption is inconspicuous. .
As a specific packaging form for each food, when the food is meat such as beef, chicken and pork, fish, fish, etc., the food is brought into contact with the surface of the non-permeable film or semi-permeable film. Vacuum packaging using a non-breathable film in the state is used, and when the food is fish, fish meat, vegetables, fruits, etc., packaging with a liquid absorbing sheet placed so that the liquid permeable film side faces the food Is used.
[0027]
The non-breathable film used at the time of vacuum packaging may be a non-breathable film such as polyethylene, polypropylene, and polyvinyl chloride generally used for food vacuum packaging, a shrink film, and the like. Moreover, the vacuum degree at this time should just be more than the grade which the foodstuff, the liquid absorption sheet of this invention, and a non-breathable film closely_contact | adhere.
[0028]
The identification mark used in the liquid-absorbing sheet of the present invention may be colored on the sheet-like liquid-absorbing material or the packaging material itself, and may be inserted into a colored film, tape, thread, sticker sticker, mark printing, etc. The surface can be distinguished by The easiest way to produce is to give an identification mark to a non-permeable film or semi-permeable film, which is a preferred embodiment.
The design of the identification mark may be a uniform color for the entire film, but may be a striped pattern or a small pattern such as polka dots. In particular, from the viewpoint of distinction and clarity, it is possible to select a color tone for each application by putting small patterns such as fish, cow, chicken, pig, vegetable, fruit, etc. in accordance with each application. As the color of the identification mark, the same color as that of the drip when the drip is absorbed or the color of the identification mark becomes unclear is selected. Specifically, as a combination of food and color, for example, a red color is preferable for a liquid absorbent sheet used for beef packaging, and a green, yellow, or brown color is used for a liquid absorbent sheet used for vegetable or fruit packaging. The liquid-absorbing sheet used for poultry, pork or fish packaging is preferably pink, yellow or brown.
Since the identification mark only needs to be able to clearly distinguish the front and back of the liquid-absorbing sheet, it may be provided on either the front or back side, but is preferably provided on the side that cannot be seen from the outside after packaging.
[0029]
The pigment that can be used for coloring the identification mark is not limited as long as it is a pigment that can be used for food packaging. For example, when the material of the tape or film is polyolefin, the dyes listed in “Positive list on food packaging made of synthetic resin such as polyolefin” of the Sanitation Council for Polyolefins can be used. Specific pigments include red pigments such as food colors corresponding to foods and food additives, yellow pigments such as β-carotenes, green pigments such as chlorophylls, and brown pigments that are mixtures of these pigments. Can do.
Moreover, in order to print on a film and a seal | sticker, what melt | dissolved the pigment | dye mentioned above in the solvent which can be used for foodstuffs, such as water and ethanol, can be used.
[0030]
Examples of the fresh food to which the absorbent sheet for packaging of fresh food of the present invention can be applied include frozen products such as tuna, skipjack, salmon, etc. Examples include chilled products and fresh products, such as various products with drip having a red color, vegetables, and fruits.
[0031]
【Example】
Example 1
As shown in FIG. 1, the whole non-liquid-permeable film 2 is made red using a red color masterbatch at the time of film production, and the non-colored nonwoven fabric (liquid-permeable film) 3 which consists of polyethylene and polypropylene, 3 sides were heat-sealed to form a cover-shaped packaging material. A pulp (sheet-like liquid absorbent material) 1 carrying a polymer absorbent was sandwiched between the packaging materials and the entrance was heat-sealed to obtain a liquid absorbent sheet for fresh food packaging materials.
[0032]
(Example 2)
As shown in FIG. 2, in place of the colored non-permeable film 2 in Example 1, a non-colored polyethylene film 5 was used to form a cover-shaped packaging material. A sheet-like liquid absorbent material 1 prepared in the same manner as in Example 1 is put in this, a red polyethylene film tape 4 is inserted between the polyethylene film 5 and the sheet-shaped liquid absorbent material 1 and the entrance is heat-sealed to prepare a fresh food packaging material. A liquid absorbent sheet was used. When the polyethylene film 5 and the nonwoven fabric 3 were used as a cover-like packaging material so that the tape would not move inside, the heat seal part was nipped and sealed.
[0033]
(Example 3)
As shown in FIG. 3, in Example 2, instead of the red polyethylene film tape, the red food was dissolved in ethanol, and this was printed on the liquid-impermeable film 5 using an inkjet printer and dried.
[0034]
Example 4
As shown in FIG. 4, in place of the red polyethylene film tape in Example 2, a red film-like seal 7 was attached. The sealing is performed using starch paste, or is heat-sealed so that there is no problem in food hygiene.
[0035]
【The invention's effect】
The liquid-absorbent sheet for fresh food packaging material of the present invention uses an innocuous colorant that can be used as a food packaging on the fresh food side as an identification mark, and thus greatly reduces the possibility of errors even before packaging. In addition, misused products are not only easily identifiable even after packaging, but the use of the absorbent sheet after absorbing the drip is unknown or unclear depending on the color of the drip. It becomes possible to make the packaged products that are comfortable for the consumers.
[0036]
[Brief description of the drawings]
FIG. 1 is a plan view and a cross-sectional view of a first embodiment of the present invention.
FIG. 2 is a plan view and a cross-sectional view of a second embodiment of the present invention.
FIG. 3 is a plan view and a cross-sectional view of a third embodiment of the present invention.
FIG. 4 is a plan view and a cross-sectional view of a fourth embodiment of the present invention.
[Explanation of symbols]
1 Sheet-like liquid-absorbing material 2 Non-liquid-permeable film colored red (a semi-liquid-permeable film is also acceptable)
3 Liquid-permeable film 4 Colored tape 5 Non-colored non-liquid-permeable film (semi-permeable film)
6 Printing on non-colored non-liquid permeable film 7 Colored seal

Claims (10)

A sheet-like liquid absorbing material containing a polymer absorbent and / or a wetting agent is placed in a packaging material in which one outer surface is a liquid-permeable film and the other outer surface is a non-liquid-permeable film or a semi-liquid-permeable film. A liquid absorbent sheet for packaging fresh food, in which a colored film or tape of the same color as that of fresh food is inserted into at least a part of one side of the liquid absorbent sheet, so that the liquid permeable film and the non-permeable film A liquid- absorbent sheet for packaging fresh food, characterized in that an identification mark sandwiched and sealed in a heat-sealed part with a liquid film or a semi-permeable film is provided. The liquid-absorbing sheet for packaging fresh food according to claim 1, wherein the sheet is a liquid-absorbing sheet for packaging fresh food, and the color is red. The liquid-absorbing sheet for fresh food packaging used for vegetable or fruit packaging, wherein the color is green, yellow or brown. The liquid-absorbing sheet for fresh food packaging used for packaging of chicken, pork or fish, wherein the liquid-absorbing sheet for fresh food packaging according to claim 1, wherein the color is pink, yellow or brown. The liquid-absorbent sheet for packaging fresh food according to any one of claims 1 to 4, wherein an identification mark is provided on the non-liquid-permeable film or semi-liquid-permeable film side. The liquid-absorbent sheet for packaging fresh food according to any one of claims 1 to 4, wherein an identification mark is provided on the liquid-permeable film side. The liquid-absorbent sheet for packaging fresh food according to any one of claims 1 to 6, wherein the semi-permeable film is a polyethylene film or a polypropylene film having openings formed therein. The sheet-like liquid absorbent material is a wetting agent such as ethylene glycol, propylene glycol, diethylene glycol monoethyl ether, 1,3-butylene glycol, glycerin, polyethylene glycol, polypropylene glycol, polyglycerin, xylitol, sorbitol, maltitol, methylcellulose, carboxy. The liquid-absorbent sheet for packaging fresh food according to any one of claims 1 to 7, comprising at least one member selected from the group consisting of methyl cellulose. Non-liquid-permeable film or semi-permeable film for fresh food packaging according to any one of claims 1, 2, 4, 5, 7, and 8. A method for producing a fresh food product, comprising a step of contacting a surface of a liquid film and vacuum-packing with a non-breathable film to absorb the liquid. Fresh food is caused to face the liquid-permeable film side of the liquid-absorbent sheet for fresh food packaging according to any one of claims 1, 3, 4, and 6 to 8, A method for producing a fresh food product, comprising a step of packaging and absorbing liquid.

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